3.9 stutter/stall - Dakota Durango Forum
2.5L/3.7L/3.9L Engines Questions regarding the I4 and V6 Engines

 
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post #1 of 14 Old 09-04-2019, 04:40 AM Thread Starter
Wes1311
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3.9 stutter/stall

I cannot figure this one out, I have a stutter at idle and loss of power, especially accelerating in higher gears or uphill on the highway. Revering g with a load as well. It's an 03 Dakota QC 3.9l automatic.

I have replaced the plenum gaskets
MAP
IAC
Checked for Vacuum leaks
Replaced the plugs
Wires
Cap and rotor
O2 sensor, etc.

Any input will greatly be appreciated! TIA!

-Wes

The link is a quick video I took at Idle warmed up

It's less likely to stutter when cold.

http://imgur.com/gallery/tutGyEo

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post #2 of 14 Old 09-04-2019, 12:36 PM
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Sounds like the TPS is going out. Replace with a OEM unit or you'll have trouble.
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post #3 of 14 Old 09-04-2019, 02:56 PM Thread Starter
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Quote:
Originally Posted by OFWG View Post
Sounds like the TPS is going out. Replace with a OEM unit or you'll have trouble.
Just replaced as an attempt, it seems to have slightly improved things but not very much, the stutter still exists but it has not stalled yet.

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post #4 of 14 Old 09-04-2019, 09:11 PM
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Reset the PCM by removing the negative cable from the battery for about a minute or so. Connect it back and go for a drive.
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post #5 of 14 Old 09-06-2019, 02:54 AM Thread Starter
Wes1311
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Still a small improvement but no joy. Still having a slight stutter and it stalled in reverse today. Hm

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post #6 of 14 Old 09-06-2019, 01:52 PM
OFWG
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Have you removed and cleaned the TB yet? If not, give it a try.
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post #7 of 14 Old 09-11-2019, 04:02 AM Thread Starter
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Quote:
Originally Posted by OFWG View Post
Have you removed and cleaned the TB yet? If not, give it a try.
Yes sir, I just did a compression check today, all cylinders except #3 were at 170~ psi while 3 was at 135, so it's look looking like valve seats or rings. I haven't done a wet test yet though.

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post #8 of 14 Old 09-12-2019, 02:53 AM
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I would check the short term and long term fuel trim with the fuel pressure. You would need an obd2 with live recording to see what is happening to the fuel trim. Also if the fuel pressure is dropping intermittently from a week pump this could be a symptom.
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post #9 of 14 Old 09-13-2019, 01:50 PM Thread Starter
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Quote:
Originally Posted by Fxsts12 View Post
I would check the short term and long term fuel trim with the fuel pressure. You would need an obd2 with live recording to see what is happening to the fuel trim. Also if the fuel pressure is dropping intermittently from a week pump this could be a symptom.
I did have the pump go bad on me a couple months ago

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post #10 of 14 Old 09-21-2019, 02:28 AM Thread Starter
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Is it possible a new pump is bad? Also quick update, motor has been rebuilt to fix the low compression in cylinder 3. But, the stutter is still there.

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post #11 of 14 Old 09-22-2019, 04:23 PM
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What is the fuel pressure at idle and at 3000 rpms? The concern is dropping pressure (mechanical failure) vs sensor adjustments. This would also apply to fuel injectors clogged.
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post #12 of 14 Old 09-23-2019, 06:33 AM Thread Starter
Wes1311
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I'm not too sure right now, it's basically a new pump. I'll have to get a pressure tester and check it.

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post #13 of 14 Old 09-23-2019, 08:27 PM
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Can you recreate the stutter? If it stutters in park add carb cleaner (fuel). If it does it calls for too much fuel. If not then it is starved.
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post #14 of 14 Old 09-24-2019, 04:48 AM Thread Starter
Wes1311
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It will stutter if I idle for too long. If I shut it off and start it back up, it will be good for a minute or two and start stuttering again. I tried starting fluid looking for a vaccuum leak, spraying it around the motor a week or two ago and it didn't change anything, but when I sprayed into the throttle body it died

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Last edited by Wes1311; 09-25-2019 at 02:42 AM.
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